Douglas Lake Member information

Douglas Lake Member^[1]^[2]
Douglas Lake Member
Stratigraphic range: Darriwilian PreꞒ Ꞓ O S D C P T J K Pg N
	Holotype specimen of Chasmataspis laurencii
Type	Member
Unit of	Lenoir Limestone
Underlies	nodular member of Lenoir Limestone
Overlies	Mascot Dolomite (Knox Group)
Thickness	up to 37 meters (121 ft)
Lithology
Primary	rubble conglomerate, chert conglomerate, and black dolomite
Other	Shale (shaly dolomite), volcanic ash
Location
Region	eastern Tennessee
Country	USA
Extent	discontinuous, paleokarst fills in top of Mascot Dolomite
Type section
Named for	Douglas Lake (Douglas Reservoir)
Named by	J. Bridge
Location	north shore of Douglas Lake, 2.4 kilometers (1.5 mi) northeast of the Douglas Dam
Year defined	1995

The Douglas Lake Member is a geologic unit of member rank^[2] of the Lenoir Limestone that overlies the Mascot Dolomite and underlies typical nodular member of the Lenoir Limestone in Douglas Lake, Tennessee, region. It fills depressions that are part of a regional unconformity at the base of Middle Ordovician strata, locally the Lenoir Limestone, that separates them from the underlying Lower Ordovician strata, locally the Knox Group.^[1]^[2]^[4]

^ ^a ^b ^c ^d Cite error: The named reference Bridge1955a was invoked but never defined (see the help page).
^ ^a ^b ^c ^d U.S. Geological Survey, 2020. Geologic Unit: Douglas Lake, National Geologic Map Database.
^ Cite error: The named reference Retallack2019 was invoked but never defined (see the help page).
^ ^a ^b Walker, K.R., Steinhauff, D.M., and Roberson, K.E., 1992. Uppermost Knox Group, the Knox unconformity, the Middle Ordovician transition from shallow shelf to deeper basin at Dandridge, Tennessee, In Driese, S.G., and others, eds., Paleosols, paleoweathering surfaces, and sequence boundaries, University of Tennessee, Department of Geological Sciences Studies in Geology, no. 21, p. 13–18.

[Bridge1955a-1] Cite error: The named reference Bridge1955a was invoked but never defined (see the help page).

[USGS2020a)-2] U.S. Geological Survey, 2020. Geologic Unit: Douglas Lake, National Geologic Map Database.

[Retallack2019-3] Cite error: The named reference Retallack2019 was invoked but never defined (see the help page).

[WalkerOther1992a-4] Walker, K.R., Steinhauff, D.M., and Roberson, K.E., 1992. Uppermost Knox Group, the Knox unconformity, the Middle Ordovician transition from shallow shelf to deeper basin at Dandridge, Tennessee, In Driese, S.G., and others, eds., Paleosols, paleoweathering surfaces, and sequence boundaries, University of Tennessee, Department of Geological Sciences Studies in Geology, no. 21, p. 13–18.

Douglas Lake Member information

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Douglas Lake Member^[1]^[2]
Stratigraphic range: Darriwilian PreꞒ Ꞓ O S D C P T J K Pg N ^[3]
Holotype specimen of Chasmataspis laurencii
Type	Member^[2]
Unit of	Lenoir Limestone
Underlies	nodular member of Lenoir Limestone
Overlies	Mascot Dolomite (Knox Group)
Thickness	up to 37 meters (121 ft)
Lithology
Primary	rubble conglomerate, chert conglomerate, and black dolomite^[1]
Other	Shale (shaly dolomite), volcanic ash^[4]
Location
Region	eastern Tennessee
Country	USA
Extent	discontinuous, paleokarst fills in top of Mascot Dolomite
Type section
Named for	Douglas Lake (Douglas Reservoir)
Named by	J. Bridge^[1]
Location	north shore of Douglas Lake, 2.4 kilometers (1.5 mi) northeast of the Douglas Dam
Year defined	1995